Alternator Issue - Ford Powerstroke Diesel Forum

 
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post #1 of 9 Old 04-10-2012, 07:11 PM Thread Starter
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Alternator Issue

I have the dual alt package on my 2004. The battery light comes on in the morning for about 2 minutes if the truck has sat over night. On my SCT cluster it reads around 11.4volts. After I pull out of the packing lot it goes up to between 13.1 and 13.8 and fluctuates. I've never seen it go over 14. Is there a voltage regulator that would cause this or is one of my alternators going out? Is there a way to test each one while they are still on the truck?

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post #2 of 9 Old 04-14-2012, 01:50 PM
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I had my batteries AND alternator checked in the parking lot of my local OReilly Auto parts. It does sound like a voltage regulator issue though. Oon initial start up, the exciter hasn't been spun so you are more or less running off of the batteries, once the exciter gets spun, you should see more than 14 volts. I don't know if dual batteries each have a voltage regulator or if it is just one of them since they are specified as upper and lower when you are searching for a replacement.

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post #3 of 9 Old 04-14-2012, 05:33 PM Thread Starter
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Each Alt has an independent regulator. The question is how to test each one individually.

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post #4 of 9 Old 04-14-2012, 07:34 PM
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Question

Mine rarly goes over 14 volts running ,is it supposed to.

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post #5 of 9 Old 04-14-2012, 07:40 PM Thread Starter
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It should be 14.4

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post #6 of 9 Old 04-14-2012, 07:58 PM
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Question

Quote:
Originally Posted by spastik monkey View Post
It should be 14.4
Well my diehards in it have the redeye of death in the little eye port maybe batts going bad from old age.??
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FOR SALE $19,000
2005 F-350 DUALLY
SUPER DUTY XLT
4X4,CREW CAB 8' BED
FACTORY TOW COMAND BRAKE SYSTEM
FACTORY UPFITTER SWITCHES
EDGE EVOLOUTION 11 GAUGES BUILT IN ONE
ACCUFAB INTAKE MANIFOLD
ZOODA MOD
KITTY RAN OFF
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post #7 of 9 Old 04-14-2012, 08:23 PM Thread Starter
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Definitely a possibility

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post #8 of 9 Old 04-15-2012, 01:07 PM
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Quote:
Originally Posted by spastik monkey View Post
Each Alt has an independent regulator. The question is how to test each one individually.
May sound dumb, but to test each one in the truck you could try electrically disconnecting one alternator while doing the test. I'm not sure what the dual alt purpose is because mine is a single.
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post #9 of 9 Old 04-15-2012, 04:03 PM
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Disconnect the connections at the alternator one at a time your truck can run with only one good one. Done it when one was bad. But disconnecting one line at the battery makes hard to determine the bad one.

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